Richard Gross studies the Earth's rotation.

Richard Gross研究地球的自转。

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And the answer is for the day to get shorter, Earth's rotation has to speed up.

那么关于地球上的一天为什么变短的答案是，地球的自转加速了。

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He has written many scientific articles on subjects related to the Earth's rotation.

他写过很多与地球自转有关的科学文章。

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An equatorial launch location gives a rocket a boost from the Earth's rotation, meaning it can lift heavier payloads into orbit.

BBC: Sea Launch rocket company returns to service

Use a photographic plate to record an image from a zenith-pointing telescope, and you will end up with a streaky image, as a result of the earth's rotation.

ECONOMIST: Mirror, mirror

By the time any change occurred, humans might even have generated technology that could speed up the Earth's rotation or transport us to other liveable planets within our galaxy.

BBC: Why the Moon is getting further away from Earth